How Much Can You Borrow on an Investment Property HELOC With Interest-Only Payments?

The Quick Read: It depends on your equity, because an investment-property line through Lendmire’s wholesale network is the property’s value times 70% combined loan-to-value, minus every loan already on it, capped at $500,000, and interest-only payments change what you pay during the draw period, never how much you can borrow.

• Ceiling: 70% combined loan-to-value (CLTV) on an investment property, with a 700 minimum credit score. A 720 score reaches the same 70%, so credit above 700 buys eligibility, not leverage.
• Line size: typically $25,000 to $500,000 on an investment property, subject to lender guidelines.
• Structure: a 5-year interest-only draw followed by a 25-year repayment, with at least 75% of the line drawn at closing.
• Qualification: the borrower’s credit and debt-to-income (DTI) ratio, up to 50%, with the payment figured on the maximum draw.
• Title: an individual or a revocable living trust. An LLC cannot hold title on these lines.

Lendmire is a broker. It places these lines with select wholesale partners and does not lend directly, so every figure here is a guideline range, not a commitment to lend.

Key Terms Defined

Five terms carry most of this topic. Each gets one plain definition here.

Combined loan-to-value (CLTV): all loans against the property added together, divided by its value.

Draw period: the stretch when you can borrow from the line and pay interest on what you have drawn.

Interest-only payment: a payment that covers interest on the drawn balance and does not reduce principal.

Repayment period: the stretch after borrowing stops, when each payment includes principal and the balance shrinks.

Automated valuation: a software estimate of property value used in place of a traditional appraisal.

What Is the Maximum Line on an Investment Property HELOC?

The maximum is a formula result held under a hard cap. Multiply the property’s value by 70%, subtract what is already owed, and the remainder is your line, never above $500,000. If the remainder is under $25,000, there is no line to offer.

The 70% is the ceiling on this network for any investment property, with no higher tier. A primary residence is different. Those lines can reach 90% CLTV, but only at a 720-or-better credit profile. Do not carry that number over to a rental.

Investors on BiggerPockets also describe calling many small banks and hearing that equity lines are for primary residences only. On Lendmire’s network, an investment line caps at 70% CLTV. Availability runs through 16 full-service states, which is narrower than the 41-market DSCR footprint.

How the Sizing Formula Works, Step by Step

Sizing takes four steps: value, ceiling, existing debt, cap. Run them in order, and the answer comes out the same every time.

1. Value the property. An investment line tops out at $500,000, so valuation usually runs through an automated model with no traditional appraisal. A higher CLTV can trigger a second valuation, and you may request a full appraisal at any time.

2. Apply the ceiling. Value times 70% gives the total debt the property can carry.

3. Subtract existing liens. Your first mortgage, and any other loan, comes off the top.

4. Apply the cap and the floor. The line is the smaller of the formula result and $500,000. It must also reach $25,000.

Three quick examples show how the steps play out.

A rental with a 55% first mortgage. The ceiling is 70% of value. Subtract the 55% already owed and 15% of value remains. On a mid-priced rental, that is a usable line, provided it clears the $25,000 minimum.

A rental with a 66% first mortgage, bought recently with a small down payment. Only 4% of value remains. On a modest-priced property that lands below the $25,000 minimum, so no line is available. Because 700 is the credit floor and a score above it buys no extra leverage, the first-mortgage balance is the number that decides the outcome here.

A high-value property with a small first mortgage. The formula can produce a number above $500,000. The cap wins, and the investment line stops at $500,000. Lines above that size exist only on primary residences.

One limit stays hidden until you stack lines. A borrower may hold up to three lines, and combined exposure is capped by program: $750,000 on the longer-runway program and $2,000,000 on the higher-leverage program. These are the two wholesale programs the network uses for equity lines. A borrower with more than 15 financed properties is not eligible.

What Does Interest-Only Mean on This Line?

Interest-only means your required payment covers interest on the drawn balance and nothing toward principal. It makes the early payment smaller than a fully amortizing payment would be. It does not make the line bigger.

Three details on this product matter more than the label.

First, you do not choose a small draw. At least 75% of the line is drawn at closing, so the interest-only payment starts on most of the line from day one. A flexible, draw-only-what-you-need line is not what this structure delivers.

Second, the payment floats. Pricing varies across both the draw and repayment periods and never converts to a fixed figure. The payment can move even when you borrow nothing more.

Third, qualification runs on the biggest possible payment, not the one you plan to make. The DTI test, up to 50%, uses the interest-only payment calculated on the maximum draw. A larger line therefore raises your qualifying debt even if you never touch the unused portion. Credit from 600 to 679 faces a tighter 45% DTI limit, and an investment line floors at 700, so that tier never applies to a rental.

Minimum and initial draws are a feature of the plan, not a surprise. The CFPB’s HELOC booklet notes that some plans require an initial draw and that payments can change even if you borrow no more. Interest-only is a plan feature rather than a universal rule.

What Happens When the Draw Period Ends?

When the draw ends, borrowing stops and principal comes due with interest. On an investment line that means a 25-year fully amortizing repayment after the 5-year interest-only draw. The payment steps up because it now includes principal.

The CFPB’s explanation of how a HELOC works warns that payments are often much higher once repayment begins. In some plans the whole balance can come due at that point. Read your line’s repayment terms before you draw, not after.

Interest-only draws also leave the balance flat. After five years of draw-period payments, you owe what you drew. If the property’s rent has not grown or its value has slipped, the repayment step lands on the same thin cushion you started with.

Test the repayment payment against the property’s rent, not just the draw payment. The honest question is whether the property still carries the debt when the payment steps up.

Who Qualifies, and What Gets Checked?

A HELOC qualifies the borrower, not the property’s rent coverage. The file looks at credit, DTI, and the equity left after existing liens. Rent does not drive the decision the way it does on a DSCR loan.

For an investment line, the network’s file checks work like this:

• Credit: a 700 minimum with no tier beneath it. The score model is a single-bureau score keyed to the primary wage earner, and the report can be no more than 90 days old at closing.
• Derogatory history: a bankruptcy needs 4 years of seasoning from discharge or dismissal. Investment files follow a 7-year path for a foreclosure and 4 years for a deed-in-lieu, pre-foreclosure, or short sale.
• Property types: single-family homes, 2-4 units, PUDs, townhomes, and condominiums, including non-warrantable ones. Manufactured homes, co-ops, condotels, log homes, commercial, mixed-use, and agricultural-zoned properties are not offered.
• Title: fee simple or leasehold, held by you personally or by a revocable living trust. LLCs, corporations, partnerships, and irrevocable, blind, or land trusts cannot hold title.

Title is the sharpest difference from a DSCR loan. A rental already deeded to an LLC needs a vesting change before a line is possible, or a DSCR cash-out refinance may fit better. DSCR loans to LLC-titled borrowers are available subject to lender program eligibility.

One practical point on the business side: a line secured by a rental property is business-purpose credit. Federal consumer-credit rules exempt business-purpose credit, so some consumer HELOC protections may not apply to a rental line. Read the actual note terms.

Rental or Primary Residence: Which Property Secures the Line?

Many investors never borrow against the rental at all. They draw on their own home and use the money to buy a rental. The two products size very differently.

The primary-residence column reaches higher, but it puts your home behind the debt. A primary-residence line above $500,000 carries its own credit minimum: 700 or better, or 720 on the longer-runway program. That size also caps at 75% CLTV and requires a full appraisal. Separately, combined exposure across a borrower’s lines is capped by program, at $750,000 on the longer-runway program and $2,000,000 on the higher-leverage program.

The trade-off is plain. Borrowing against the home gets you more room. Borrowing against the rental keeps the risk on the rental. Neither option is free of risk, and the right one depends on how much of your net worth you want tied to one roof.

When a DSCR Cash-Out Fits Better

A DSCR cash-out refinance suits investors who need more than a line offers, or who hold title in an LLC. It is a lump-sum loan that qualifies primarily on property-level rental income covering the payment, subject to lender guidelines. Lendmire’s complete DSCR loans guide covers how that works in full.

Short-term-rental cash-out refinances sit lower, typically at 70% LTV. Most cash-out programs want about 6 months of seasoning. Reserves vary by lender, leverage, and loan size, and are commonly around 6 months of PITIA (principal, interest, taxes, insurance, and association dues).

A strong coverage ratio does not equal positive cash flow. DSCR compares rent to PITIA only, so repairs, vacancy, management, and utilities sit outside the ratio. The same caution applies to any HELOC draw you plan to carry.

A DSCR route also helps when your personal DTI is stretched by many properties. The exposure limits on the HELOC side, three lines and 15 financed properties, make that shift more likely as a portfolio grows.

The Risks Worth Pricing In

Three risks shape an interest-only investment line. The first is payment movement: pricing floats in draw and repayment, so your cost is not fixed. The second is the repayment step-up, covered above. The third is that you are borrowing against equity, and equity can shrink.

A line also pairs poorly with a plan to buy the next property entirely with borrowed money. Investors on BiggerPockets disagree about using a HELOC for a down payment, and one concern raised there is that a property bought entirely with borrowed money starts with no equity.

If the interest connects to rental use, tax treatment can matter. Tax treatment varies; consult a qualified professional.

Next Step

If you are considering a home equity line and want to see how the numbers work, Lendmire can help you compare HELOC options based on the property, the equity available, credit profile, combined leverage, and your goals. The editable calculator on the site gives an illustrative estimate you can adjust. Call 828-256-2183 or request a quote.

About Lendmire

Lendmire is a mortgage brokerage (NMLS# 2371349) arranging home equity lines of credit — primary-residence, second-home and investment-property lines — through a wholesale lending network in its 16 full-service states. Eligibility is determined by the lender on each file. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.

References

1. BiggerPockets

2. CFPB, HELOC booklet

3. CFPB: What Is a Home Equity Line of Credit HELOC

4. BiggerPockets